Utilization of Construction and Demolition Waste in Rigid Pavement
摘要
This research addresses the challenges associated with construction and demolition (CDW) generation and under-utilization, proposing its effective use in rigid pavement construction as a sustainable alternative. Excessive extraction of natural resources for new construction poses significant environmental concerns, which are further aggravated by the accumulation of unprocessed CDW, contributing to water body degradation, air pollution, and soil contamination. Although the use of CDW in pavement construction is recommended under the CDW Management Rules, 2016, this study investigates the potential of recycled sand and aggregates derived from CDW for pavement applications. A comprehensive testing programme was carried out to assess the suitability of these materials for rigid pavement construction by performing aggregate tests, including specific gravity, water absorption, bulk density, impact value, and crushing value. The study involved partial replacement of virgin coarse aggregates with recycled aggregates at levels of 25%, 35%, and 40%, along with complete replacement of crushed or river sand with recycled sand. Structural specimens in the form of cubes and beams were cast to evaluate compressive strength and flexural strength for different replacement proportions. The results demonstrate that recycled aggregates can replace virgin aggregates up to 40% and natural sand up to 100% without adversely affecting performance. The findings highlight the potential of CDW recycling in enhancing sustainability in rigid pavement construction by reducing environmental impacts and dependence on virgin resources, thereby promoting eco-friendly and resource-efficient construction practices.